To answer the other question: there exists a checkmate with two queens. Just pin the king into a corner with one, and guard that queen with another.
But can you actually pin a noncooperative king there with only 2 queens? You can in 2D, but hardly in 3D and even less in 4D.
To answer the other question: there exists a checkmate with two queens. Just pin the king into a corner with one, and guard that queen with another.
But can you actually pin a noncooperative king there with only 2 queens? You can in 2D, but hardly in 3D and even less in 4D.